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11/9-13/2002AMIA 200220 Conclusion A new document indexing paradigm based on phrases is proposed Use phrases (concept and its word stems) as terms Document similarity is derived from both the stem and the concept contributions Conceptual similarity quantifies the concept relations and improves retrieval effectiveness Stems remedy the incomplete coverage of the knowledge base (missing concepts and missing links between related concepts) Experimental results reveal a significant retrieval effectiveness improvement of the phrase-based VSM over the stem-based VSM

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11/9-13/2002AMIA 200221 Acknowledgement This research is supported in part by NIC/NIH Grant#4442511-33780